Drop hammer and carriage therefor



Nov. 17, 1953 E. E. DORKINS 2,659,583

DROP HAMMER AND CARRIAGE THEREFOR Fi led Jan. 16, 1950 6 Sheets-Sheet l 'Zmventor 51 40 5 Dar/ ins Gttomegs Nov. 17, 1953 E. E. DORKINS DROP HAMMER AND CARRIAGE THEREFOR 6 Sheets-Sheet 2 Filed Jan. 16, 1950 3 nventor 51 00 .5 Oar/(777.5.

Gttornegs Nov. 17, 1953 E. E. DORKINS DROP HAMMER AND CARRIAGE THEREFOR 6 Sheets-Sheet 3 Filed Jan. 16, 1950 1 w nusi 3noentor 50/7 5 fioh/hs- 7 (Ittornegg Nov. 17, 1953 E. E. DORKINS 2,659,583

DROP HAMMER AND CARRIAGE THEREFOR Filed Jan. 16, 1950 6 Sheets-Sheet 4 [ran 5. Dork/0s Gttornegs Nov. 17, 1953 E. E. DORKINS 2,659,583

DROP HAMMER AND CARRIAGE THEREFOR Filed Jan. 16, 1950 a Sheets-Sheet s Zinnentor B 5 0 5.0050276 '5 WWW Gttornegs Nov. 17, 1953 E. E. DORKINS 2,659,583

DROP HAMMER AND CARRIAGE THEREFOR Filed Jan. 16, 1950 e Sheets-Sheet e Ihwentor 8 5 02? 45. Dar/(1)73 w attotnegs Patented Nov. 17, 1953 Evan- E.-;Dorkins, Ottawa, Kans., assignor to Ottawa Steel Products, 1110., Ottawa, Kans., a corporation of Kansas Application January 16, 1950, Serial No. 138,811

5 Claims.

This invention relates to drop hammers and carriages therefor and more particularly to a portable hydraulically operated drop hammer on a carriage adapted to be towed or otherwise moved to places of use for driving and/or pulling posts and performing other-work such as breaking, cutting or otherwise hammering and/or tamping pavement, soiland the like.

The objects of the invention areto-prov-ide a se1f-contained,-portable unit including a carriage, power driven hydraulic system and an hydraulically operated drop hammer mechanism adjustably mounted on the carriage for vertical operation of the hammer when the carriage is on uneven or sloping surfaces; to: provide-a portable, hydraulically operated drop -hammer mechanism on a carriage adapted to perform a large variety of functions both =When=stationary and when towed or otherwise moved over a surface as in road or right of way repair and maintenance; to provide an hydraulically'operateddrop hammer mechanism mounted on a suitablecarriage in such a manner asto' be tilted in any direction from a relatively vertical position and operatedin said tilted position; to provide hydraulic means for raising an impact member or hammer as desired up to the upper limit of its motion and dropping the same by release of the hydraulic fluid; to provide hydraulic mechanism having control of a drop hamm'er-at all times to permit substantially free falling'of the hammer; to provide a drop hammer trackwaymounting adapted for folding said trackway relative to a carriageior travel to locations-of work to provide forcontrolling operation of the hydraulically operated drop hammer from the driving seatof a towing vehicle; to provide a drop hammer structure and adapter for attaching various tools suchas concrete breakers, chisels and tampingheadsthereto; to provide a multipurpose hydraulically operated drop hammer and carriage therefor that is light inweight and easily maneuvered, placed in position and operated by one man; and to provide apparatus of this character that is economical to manufacture, sturdy in construction and efficient in operation to give either fast'or slow and light or hard smashing blows with substantially no shock to the apparatus or operator.

In accomplishing these and other objects of the present invention, I have provided improved details of structure, the preferred forms of which are illustrated. in the accompanying drawings, wherein:

Fig. 1 is a perspective view of the hydraulically operated drop h'ammermounted on a carriage therefor.

Fig. 2 is a plan view of the carriage, the hammer and trackway therefor being shown in section to illustrate the structure thereof.

Fig. 3 is an end elevation of the hammer and carriage therefor with a tamper attachment, portions'being broken away to better illustrate the structure thereof.

Fig. 4 is a partial elevation of the carriage-and hammer trackways illustrating the tilting mechanism and trackways in partially folded condition.

Fig. 5 is a side elevation of the carriage and trackway in folded condition.

Fig. 6 is a longitudinal sectional view through thehydraulically operated hammer and carriage therefor with the trackways for the hammer-in upright position for operation of the'apparatus.

Fig. 7 is a diagrammatic view of the hydraulic system for operating the hammer.

Fig. 8 is a partial perspective view-illustrating the hydraulic hammer mechanism used for pulling posts.

Fig. 9 is a perspective view of the towing hitch mechanism for the carriage and control for the hammer for operating same during movement of the carriage.

- Fig. 10 is a disassembledperspective view ofthe hammer, adapter head and road patch remover tool.

Fig. 11 is a perspective view of a concrete break ing head for attachment-to the hammer.

Fig. 12 is a perspective View of a cutter trim tool adapted to be connected --to the hammer adapter head.

7 Fig. 13 is a scoring chisel adapted to beconnected to the adapter head of the hammer.

Fig. 14 is a disassembled perspective view of an extension and tamper tool adapted to be connected to the hammer by the adapter head.

Referring more in detail to the drawings:

I designates amultipurpose hydraulically operated hammer mechanism and carriage therefor embodying the features of the invention and adapted to beconnected-to a tractor or other vehicle 2 for towing to locations where work is to bedone and also for towing-during actual operation of the hammer. The carriage consists of a frame 3 preferably formed of tubing and having a substantially 'U-shaped member 4, the 'legs- 5 and 6 of which form the-side members of the frame, the bridge portionof the U being arcuate and forming one end I of the frame with the legs 5 and 6 diverging slightly therefrom. -The legs are preferably connected by spaced transverse members 8 and 9, the member 9 preferably being located substantially at the ends of the legs 5 and 6. A pan or other suitable container ID for tools and the like is mounted on the frame adjacent the end '1 thereof and is additionally supported by a transverse member I having its ends secured to the legs 5 and 6. The container also may be used for suitable weights for balancing the apparatus if desired.

Supporting members l2 and |3 are arranged transversely of and secured to the legs 5 and 6, preferably between the container l8 and the cross member 8. An hydraulic pump l4, hydraulic fluid reservoir I5 and prime mover l5 are carried on said supporting members, the prime mover l8 having suitable driving connection ll with the pump for supplying hydraulic pressure as later described. An axle |8 is preferably secured to brackets l9 extending downwardly from the frame 3 substantially under the transverse member 9, said axle preferably being rigid with the frame. Portions of the axle I8 extend outwardly from the sides of the frame and rotatably mounted thereon are wheels 28 preferably having pneumatic tires 2| thereon for supporting the respective end of the frame 3.

A bracket 22 is rigidly secured to the end of the frame 3 and extends forwardly thereof to mount a portion 23 of a trailer hitch connection with a vehicle such as a tractor, automobile or the like. The bracket 22 includes vertically spaced members 24 and 25 having aligned aperture 28 therein. A shaft 2'! extends through the apertures 26 and is rotatably mounted therein, said shaft having a collar 23 engaging the lower spaced member 25 and a transverse hole 29 slightly above the upper spaced member 24 for receiving a cotter pin 20 or the like. A washer 3| is preferably arranged between the cotter pin 38 and the upper spaced member whereby the cotter pin and collar 28 prevent endwise movement of the shaft 21 relative to the bracket 22. A transverse bore 32 is provided adjacent the upper end of the shaft 21 for receiving a bar 33, said bar being held in place by a suitable screw or other clamping means 34.

Fixed on the lower end of the shaft 21 is a bearin sleeve 35 having a bore 35 adapted to rotatably mount a shaft 31 of a yoke 38 which has spaced arms 39 having apertured ends 48 for receiving an axle 4| A wheel 42 is rotatably mounted on the axle 4| and preferably has a pneumatic tire 43 thereon for providing rolling support for the forward end of the frame 3. Fixed to the yoke 38 at each end of the bearing sleeve 35 are arcuate plates 44, said plates being connected at their ends by bars 45 and 46 and also having spaced aligned apertures 41 and 48 for receiving a bolt 49 whereby the bars 45 and 46 and bolt 49 cooperate to fix the yoke in selected angular position relative to the frame 3 for adjusting the height of the front end of the frame when the tire 43 is engaged with the ground or other surface and also for raising the wheel out of engagement with the ground when the apparatus is being towed from one location to another.

Brake shoes 50 are mounted on arms 5| fixed to the ends of a transverse shaft 52 which is rotatably mounted in suitable brackets 53 depending from the frame leg members 5 and 6. Also fixed to the shaft 52 is a lever 54 having suitable means for engaging notches 56 in a segment 51 whereby movement of the lever 54 moves the brake shoes relative to the peripheries of the tires 2| for releasin or engaging the shoes with said tires to hold the carriage in selected location. Brackets 58 and 59 are secured to the transverse members 8 and 9 substantially on the longitudinal center of the frame 3. Each of said brackets has spaced ears extending upwardly from the transverse members and have aligned apertures for receiving the shanks of bolts 68 or other suitable member adapted to rotatably mount bearing members 6| and 62 on the lower ends of a trackway supporting frame 53 whereby said frame may be oscillated or swung about a longitudinal axis relative to the frame 3.

The trackway supporting frame 53 preferably consists of spaced tubular members 64 and 65 having one end thereof turned downwardly as at 66 and converging to the bearing member 6| which is suitably secured thereto. Brace members 61 have one end secured to the bearing member 62 and their other ends diverging and secured to the frame members 84 and 65 to form a rigid trackway supporting frame. The members 51 are preferably connected intermediate their ends by plates 68 suitably secured thereto and carrying a bolt 69 which extends through a slot 18 in one end of a brace arm 1|, the other end of said brace arm being pivotally mounted on ears l2 suitably secured to the transverse member 9 in spaced relation to the bracket 59 whereby the bolt 9 may be tightened to aid in retaining the trackway supporting frame in selected position.

Swinging movement of the trackway supporting frame 63 about the axis through the bearing members 6| and 52 is preferably positively controlled by an arm 13 having one end pivotally mounted as at 14 on an ear 15 carried by the tubular member 65, the other end of said arm preferably being pivotally mounted on trunnions 18 carried by a nut H which is threadedly mounted on an adjusting screw 18 rotatably mounted in spaced bearings 19 and 88 on the transverse member 8 whereby said screw 18 is rotatable about an axis transversely of the frame 3. The screw is provided with a crank 8| for rotating said screw and turning of th screw moves the nut 11 transversely of the frame 3 to positively move the trackway supporting frame about the longitudinal axis defined by the bearing members 8| and 62. The ends of the members 64 and 65 are rigidly secured to a yoke member 82 havin spaced ears 83 extending rearwardly of the frame. The ears 83 have apertures which align with apertures 84 in pairs of ears 85 for mounting pins 86 to form pivotal connections therebetween. The pairs of ears 85 are rigidly secured to the respective upright members 81 and 88 of a trackway 89 whereby said trackway is carried by the trackway supporting frame 63 and is tilted laterally of the frame 3 when the track- Way supporting frame is moved on the longitudinal axis defined by the bearing members 6| and 52 and the aligned pins 85 being on an axis transversely of the frame 3 permit tilting of the trackway longitudinally of said frame as later described.

The upright members 81 and 88 are channelshaped and are connected at their upper ends by a channel-shaped cross member 90. Cooperating with the cross member 90 to retain the upright members 81 and 88 in proper spaced relation and form a rigid structure are spaced connecting bars 9| and 92, the bar 9| preferably being substantially intermediate the height of the upright member and also spaced above the pairs of ears 85 and the bar 92 is preferably adjacent the lower end of said trackways. Each of the bars 9| and 92 has end portions 93 suitably secured as by weldingzto the :onter:surifaces. of the webs of the up..- rightimemberstandthe ;connection:portiongis arcuatecwhereby'the central portion: extends for wardlys-of ztheupright; members and. are suitably spaced therefrom-to permit free movementof. a hammer or impact member 94 whichisgslidably mounted in thechannel-shaped-z upright members illustrated in:.Figs; 2 and-6.. The member 9I also. preferably has ears; 95*.extending rearward:-

lyy-of the :trackway membersfor-connection witha'tow member as .later described;

The hammer-'94 may be of any desired shape;

but is illustrated: as having a substantially cylindrical portion96'1havinglaterallyextending side flanges ST and 98 adapted-to slidablyengage in the channels. .99 and I90 intheauprightrmembers 81 and '88; The'lowel'rfaceof :the hammer is-pref-v erably: concaved as at I ill to aid in driving:- posts, 1 without. splinter-mg the top. of :same; and also to 20 receivean adapter which may be secured-to the hammeras later described.-

lniorder toraise and lower the hammer 94-inthe-trackways; I preferablyprovide an hydraulic cylinder H32 having a'plunger IOSadapted tobe operated by fluid fromthepump I4 or other suitable source of .fluidpressure. The. cylinder'is rigidly secured outsidethe upright. member 81. by a bracket Illiadj-acentthe lower end. of-said cylinder, theupper end of-said cylinder being securedto a lateral extension .of the cross member 90 atthetop of the trackway. The lower end of the plunger. IDS is provided with. a. sheave. or

pulley. block I05 and. spaced pulleys I06 and I07. are rotatably mountedon ,the'cross member 99 to guide a.cable 108 operating thereover. One

end. of thecable I 981s. attachedto the upper end of the hammer .94 inany suitable manner. Whereby saidcable is .adapted torun overthepulley- I01, pulley I 96, pulley I I35 and have its .opposite. end secured to the bracketl 04 OrotherstatiOnary Also. the sheave pulleys vllli'and I061 Hydraulic fluid for operating the plunger I03 is provided-bythe pump I4 which preferably. has. a pressure responsivebypassbuilttherein: A'fiuid line I09 leads from the pumpto a valve H6 provided with an actuating lever III.

A fluid line. I I2 connects between the "control valve I I and. theiupper" endaof. the cylinder. M2 for supply, of.-

fluid'backof the plunger I93 for actuating same.

Areturn line H3 is connected .betweenthe coni trol valve Ill] and the fiuidsupply-reservoir l5.

Thecontrol valve! I ll-has three positions, one :to.

raise .thehammer, oneto. lower the hammer and the central .or holdposition. Raising andnlower- I eration of the control valvelever I I I. When'the;

ing of. the hammer is manipulated through-ope hammer is. raised through operation of- ,the lever;

the return of thelever-.-toloweredpositionwill open aporton. the return side of the valveand:

thereturn lines are of ae,d-iameter to allowthe hammerto drop substantially. freely without.=back.-;

the cross member 90 to the ground. Thezlength. of the strokeof the hammerzmay'be. regulated.

by the control valve and. .also. the hammer may; be stopped asdesired: in selected. vertical. position .ears; IIB fixedto the CQnnectingJbar-SI.

6* by moving. I the lever I I I to the-neutral. 0r;.hold position;

The trackways ,89 maybe tiltedqfore .and aft; or longitudinally of the carriage-by moving said traekways aboutthe axis of the: pins 86. The; trackways are moved and also heldin selectedv position by means oi? an adjustable; .foldableg; brace l IS. The brace H5 consistsofa link-l I6-- j having one end pivoted on a pin III carriedby? The: other end of the-linkl I6 ispivotally mounted on a pin I I 9 carried by spaced arms I intermediate; the ends thereof. Theadjacent ends of the arms 20 are'providedwithapertures I2I adaptedyteg; align with an aperture I22 in; the link'II6-when.-. the linkand arms are in-alignment for receiving a .bolt- I23 for retaining the linkwand armsasa; stiiT brace member. The arms IZIlpreferablyyare, providedwith a. stop I24 adapted to be engaged iby the linkI 56 when in alignment with the:arms=:

I20 whereby the link .and arms may bepivoteda on the pin H9 in one direction-only for folding; the brace I 5. The oppositeend of the arm,s"I2(I v are fixed to a-nut I25 having a threaded .bore' 'adapted to receive a threaded shank I2! ofan adjusting screw I284, The screw- I28 is rotatably mounted and fixed against longitudinal movement in a bearing -member I2 9 having trunnions-I30' rotatably mounted in a bracket I3I fixed to the.. members he and :65 adjacent the bend thereof; The adjustingscrew isprovidedwith a cranle; member i32' to facilitateturn-ing-of the :screw; With this arrangement, turning; of the, crank I 32 screws the shank I2! intopor out of the nut 125.; to lengthen or shorten the brace, I I5-and when the. link I i6 and armsJZU are held in; alignment, as illustrated in Fig.5, theturning of-the'crankc I32 will tilt the trackwayiore :or aft ,of;,thexcarename;

When it :isdesired;:to position. the :trackways as illustrated in Fig-flier transportationthe hammer es is preferably positionedrelative to. the pins 35Tf0l"; the mostz advantageous position for loweringrithe. trackways; The crank I32 'is: then turned to 1 tiltthe: trackway whereby: the top thereof moves toward the front 'ofithe car-1 riage: The'bolt J23 isthen removedfrorn-the apertnresxIEI and422 whereby'the linkmI Ifigand the arms I 20 may be relatively-pivotedonzthepin: I9 as illustrated'in Fig 4. Thetop .ofthe track-'1' ways are then pulled over toward-the front of the carriage to the position .shownpin Fig. 5; whereby a stopmember M3 on the bar SI engages; aiplate'liii. on the *frame member 54. Suitable fastening devices I35 may betapplied to thestop and plate for retaining the trackways in foldeds; position during the transportation. Also suitableapertures may be arranged in 'the fianges 'of'the upright members Sland flfi for receiving bOltST I37; said bolts being spaced whereby they substam tial-l'y engage the ends of the flanges a? and 98fto retain-the hammer against. movement in the: trackwaysrduring. transportation.

A foot member I38 has a leg- I353;slidably. mounted "in-guides 1 GI) secured. to the outer iaee of the upright member 82'. Spaced plates I4-I are secured on the. upright 'member 8'! err-opposite: sides of the-leg I39, said plates havinga plural: ity' of apertures I 52 for receiving a pin H53;-- adapted to engage lugs M4 on the leg I39- to. selectively anchor the foot member relative to the upright-member with the foot member-enrga-gingthe ground to provide supportto thee trackways. Arranged'on: the Ipulleyblock .I Q-Eeis a clevis. I 35 to-whicha chainlfifi may be attached;

In pulling posts or the like, the foot member I38 is secured to the upright member 81 with said foot member engaging the ground. The chain I46 is then wrapped or otherwise secured to a post I41 to be pulled and said chain connected to the clevis I45, when the plunger I03 is in partially extended position. Then by manipulation of the valve III to drop the hammer and the dropping of said hammer will provide a jerking force when the chain I46 becomes taut to loosen the post and then the gravity acting on the hammer or additional dropping of the hammer will tend to apply sufiicient force to the chain through the cables and pulley blocks to pull the post from the ground.

When used for repairing or maintaining highways and right of ways, it is desirable to use different attachments to the hammer 94 depending upon the particular work to be done. In order to apply the attachments to the hammer, said hammer is provided with bosses I48 adjacent the lower end thereof, said bosses having apertures I49 adapted to align with apertures I50 in bosses II of an adapter head I52 whereby bolts I53 will extend through the apertures I49 and I50 and be engaged by nuts I54 to secure the adapter head on the bottom of the hammer 94. The adapter head is provided with an axial aperture I55 for receiving the shank I56 of various tools to be used on the hammer. The shank of each tool is provided with a groove I51 adjacent the side thereof for alignment with a transverse bore I58 in the adapter head for receiving a pin I59 to key the shank I55 of the respective tool in the adapter head.

The tool I60 illustrated in Fig. is a patch removing tool which has a plate IGI adapted to engage the lower end of the adapter head and depending from the plate is a pointed member I 62 which is particularly adapted for removing a patch from a hard surface road. A cutter trim tool I83 is illustrated in Fig. 12, said tool having a shank I 56 with a groove I51 therein and is provided with a surface I64 surrounding the shank and adapted to engage the lower surface of the adapter head I52. The particular tool is semicircular in shape with a peripheral edge I85 adapted to cut or otherwise trim places being repaired in roads. A chisel I68 is illustrated in Fig. 13, said chisel having a shank I56 with a groove I51 therein which is similar to the shank of the tool illustrated in Fig. 10. Said chisel also has a surface 151 adapted to engage the bottom of the adapter head I52 and is provided with a sharpened lower end I58 to score or otherwise mark pavement or the like in the repairing operation.

A tamping tool I69 is illustrated on the hammer in Fig. 3 and also in disassembled relation in Fig. 14. The tamping tool preferably is provided with a suitable extension I10 whereby it may be used in trenches and the like to tamp the ground without the hammer dropping from the trackways. The extension I10 is preferably a cylindrical shaft of suitable size to be received in the aperture I55 of the adapter head and also in an aperture I1I in the tamping head I12. Grooves I13 are provided adjacent each end of the extension I10 to align with the aperture I58 in the adapter head I52 and with an aperture I14 in the tamping head I12 whereby pins I59 and I may be inserted in said apertures and engage in the grooves to retain the extension in the adapter head and tamper head respectively. In order to transmit the force from the said breaker being adapted for direct connection to the lower end of the hammer 94 and is provided with bosses I having apertures I8I adapted to receive bolts for securing the paving breaker to the hammer. The lower surface of the paving breaker is preferably arcuate or ballshaped but may be otherwise shaped to satisfactorily break the pavement.

In using various tools on the hammer, it is sometimes preferable to continuously move the hammer and carriage therefor along the line of operation of the hammer and to provide control of the operation of the hammer from the seat of the towing vehicle, for example the tractor 2. In such operations a hitch I 82 is connected to the carriage and traokways. The hitch preferably consists of a U-shaped member I83 having ends suitably secured to arms I84 on the transverse member 9, said U-shaped member being provided with a clevis I85 adapted to be connected to the draw bar or the like of the tractor 2. The U-shaped member is braced by members I86 having one end connected to ears I81 on the U-shaped member and having the other end provided with a plurality of spaced apertures I88 adapted to be suitably connected to the ears 95 on the trackways 89. With this arrangement, an extension I89 is applied to the valve member and connected to one end of a lever I 90 suitably pivoted on a bracket I9I which is secured to one of the members I86 whereby the lever I90 is adjacent the side of the seat of the tractor 2. Then by operation of the tractor to draw the carriage and manipulation of the lever I90 the hammer 94 may be raised and dropped whereby the tool on the lower end of the hammer will break pavement or otherwise perform desired functions in the repair and maintenance of roads and highways.

In operation of an apparatus constructed as described, and assuming same is in the position as shown in Fig. 5, the bar 33 is inserted in the socket fixed on the yoke member 38 and the bolt 49 removed from its apertures whereby upward pull on the bar will swing the wheel 42 downwardly relative to the frame 3, lifting the hitch portion 23 whereby it may be attached to the hitch connection on an automobile or tractor. The wheel 42 is then swung back upwardly to the position shown in Fig. 5, and the bolt 49 inserted to retain same in position. The apparatus is then moved to the location of work to be done. Again by use of the rod 33 and after removal of the bolt 49, the wheel may be swung downwardly to lift the hitch from the hitch connection on said towing vehicle and then the wheel is moved to a position to give the proper elevation of the front end of the frame 3 and the bolt 49 inserted to the proper aperture to retain the wheel in ground engagement and the frame in proper position. The fastening device I 35 is then removed from the stop member I33 and plate I34, and by applying force to the upper end of the trackway it is pivoted upwardly on the pins 88, moving the link IIB into alignment with the arms I20. When in alignment, the bolt I23 is inserted into the apertures I2I and I22 to retain the link and arms in al ignmentr By-rota'ting the crane I32 tosc'rew the I27 in thenut 125, the traolwa'ys are tilted-fore and-aft= as desired. By rotating the crank 81 to turn-the screw-'18 in the nut 11," the trackway supporting frame 63 is'moved to'provi'de-proper-side tilt of position the traekwa'ys 89 as'desiredi The engine 16 is then started to operate the pump 14 to provide the hydraulic fluid pressure to the valve -l Hl.-- The-boltsare' 'remev'edrmm the apertures in the flanges 'of the trackway to free theham-mer M for operation Then-by manipulation of the l'evei' l H to operate-the valve Hi), thehammer"may beraised upwardly as desired; and by release of the fliiid the L cyl inder 402* thehammerwill drop freely. The desired' 'tcols may be'appl ied-to' the lower end of the hammer for performing the work necessary. Also "the bitch I 82- may be-attached-toa tractor or" the'like wherebythe carriage -ma =be'- towed while the hammer is being operated toperf'orm thedes'ired work."

It is'believed obvious-I have provided a multipurpose hydraulically operated hammerand carriage therefor in such a structure that can be operated by'one man to provide smashing blows or light blows as desired on flat and sloping terrain.

What I claim and desire to secure by Letters Patent is:'

1. A portable drop hammer comprising, a carriage, a frame pivotally mounted on the carriage and: swingable about an axis longitudinally of said carriage, means adjustablyconnecting the a frame and carriagefor controlling pivotal m'ovement of the frame, a trackway, meanspivotally mounting the trackway on the frame for swinging movement about an axistran'sversely of the carriage, hingedly connected brace members one of which is pivotally mounted on the frameand the other having pivotal connection with the trackway above the pivotal mounting thereof, removable means connecting the brace members to hold same against hinging movement, one of said brace members being adjustable in length for adjustably tilting the trackway fore and aft of the carriage, said brace members having relative hinging movement upon removal of said connecting means to permit pivoting the trackway on its mounting means for folding said trackway downwardly over the carriage, a hammer having sides sliding in said trackway, a source of fluid pressure, and means selectively operated by said fluid pressure for raising the hammer in the trackways,

said means upon release of the fluid pressure permitting substantially free falling of the hammer.

2. A portable drop hammer comprising, a carriage having ground engaging wheels for supporting same, a frame pivotally mounted adjacent one end of the carriage and swingable about an axis longitudinally of said carriage, means adjustably connecting the frame and carriage for controlling pivotal movement of the frame, a trackway, means pivotally mounting the trackway on the frame for swinging movement about an axis transversely of the carriage, a brace arm adjustable in length and pivotally mounted on the frame, a link having spaced pivotal connections with the brace arm and with the trackway above the pivotal mounting thereof, removable means connecting the link and brace arm in spaced relation to the pivotal connection therefor for holding same in alignment for adjustably tilting the trackway fore and 1e aft of the carriage upon adjustment of the length of the brace arm, said brace arm-anddink hav ing relative pivotal movement upon removal of said removable conne'ctingmeansto'permit pressure permitting substantially free falling ofthe hammer.

3. A portable drop hammer comprising, a carriage having'grou-n'd: engaging wheels" for" sup"- porting same, a frame pivotally 'mounted adjacent one end of the carriage and-swingable about an axis longitudinally of said-carriage; means adjustablyconnecting the frame andcarriagein spaced relation to the pivotal mounting of said frame for controlling pivotal movement of the frame, a trackway, means pivotallymounting the trackway on the frame for swinging movement about an axis transversely of the-car; riage,- hingedly connected brace membersone of which is pivotally mounted on the frame and the other having pivotal connection with-"the trackway above the pivotal mounting thereof,- removable means connecting the brace member to hold same against "hinging movement, "one of said brace members being adjustable in length forladjustably tilting the trackway foreand aft ofthe carriage, said brace members having relative hin-ging movement upon removal of the-connecting means therefor to permitpivoting the trackway on its mounting means for folding said trackway downwardly over the carriage, a hammer having sides sliding saidtr'ackwayfa cylinder and piston one of which is fixed relative to the trackwaym'e'ans connecting the other to'the hammer whereby relative" movement of the cylinder and piston moves the hammer in the trackway, a source of fluid pressure, and means selectively operated to supply said fluid pressure to the cylinder to effect relative movement of the piston therein for raising the hammer in the trackways, said means being operable to release the fluid pressure in the cylinder and permit substantially free falling of the hammer.

4. A portable drop hammer comprising, a frame, ground engaging means on the frame for supporting same, a second frame pivotally mounted on the first named frame and swingable about an axis longitudinally of said first named frame, a screw and link assembly adjustably connecting the second frame and first named frame in spaced relation to the pivotal mounting thereof for effecting pivotal movement of said second frame, spaced parallel members forming a trackway, said spaced members having channels forming guides in said trackway, means pivotally mounting the trackway on the second frame, a screw and link assembly one of which is pivotally mounted on the second frame and the other having pivotal connection with the trackway above the pivotal mounting thereof, said screw and link assembly being adjustable in length for adjustably tilting said trackway fore and aft of the first named frame, a joint in the screw and link assembly for selective relative folding thereof whereby said trackway may be pivoted on its pivotal mounting for folding over the first named frame, an impact member having sides sliding in the trackway guides, a pump on the first named frame, power means for driving said pump to provide fluid pressure, a cylinder rigidly secured to the trackway, a piston in the cylinder and extending therefrom, pulleys on the end of the piston and on the upper end of the trackway, a cable having one end attached to the trackway adapted to engage and run over said pulleys and having its opposite end attached to the impact member, means for supplying fluid pressure to the cylinder whereby said piston is extended therefrom to raise said impact member, and means for releasing the fluid from the cylinder for dropping said impact memher.

5. A portable drop hammer comprising, a frame, ground engaging wheels on the frame for supporting same, a second frame pivotally mounted on the first named frame and swingable about an axis longitudinally of said first named frame, said second named frame extending upwardly from the axis of pivotal movement thereof, a screw and link assembly adjustably connecting the second frame and first named frame in spaced relation to the pivotal mounting thereof for effecting pivotal movement of said second frame, spaced parallel members forming a trackway, said spaced members having channels forming guides in said trackway, means pivotally mounting the trackway on the second frame above the pivotal mounting thereof, a brace means including two hingedly connected members one of which is pivotally mounted on the second frame and the other having pivotal connection with the trackway above the pivotal mounting thereof one of said hingedly connected members being adjustable in length for adjustably tilting said trackway fore and aft of the first named frame, removable means connecting the frame members in spaced relation to the hinge connection when said brace members are in alignment to form a stiff brace whereby removal of said removable means permits relative hinging of the brace members and pivotal movement of the trackway on its pivotal mounting for folding said trackway over the first named frame, an impact member having sides sliding in the trackway guides, a pump on the first named frame, power means for driving said pump to provide fluid pressure, a cylinder rigidly secured to the trackway, a piston in the cylinder and extending therefrom, pulleys on the end of the piston and on the upper end of the trackway, a cable having one end attached to the trackway adapted to engage and run over said pulleys and having its opposite end attached to the impact member, means connecting the pump to the cylinder for applying fluid pressure thereto for raising the impact member in the trackway, and valve means between the pump and cylinder for controlling application of fluid pressure thereto, said valve means and cylinder having a relatively large exhaust connection whereby operation of the valve means releases the fluid pressure to allow the impact members to drop substantially freely in the trackway guides.

EVAN E. DORKINS.

References Cited in the file Of this patent UNITED STATES PATENTS Number Name Date 2,121,480 Finn June 21, 1938 2,135,769 Renfer Nov. 8, 1938 2,174,415 Curtis Sept. 26, 1939 2,179,316 Anderson Nov. 7, 1939 2,335,172 Cornett Nov. 23, 1943 2,410,959 Brown Nov. 12, 1946 2,445,260 Brimhall July 13, 1948 2,476,390 Simmonds July 19, 1949 2,573,640 Connors Oct. 30, 1951 

